421444 is an esthetic number in base 4, because in such base its adjacent digits differ by 1.
It is a nude number because it is divisible by every one of its digits.
It is an unprimeable number.
2421444 is an apocalyptic number.
It is an amenable number.
421444 is a wasteful number, since it uses less digits than its factorization.
421444 is an odious number, because the sum of its binary digits is odd.
The square root of 421444 is about 649.1871841002. The cubic root of 421444 is about 74.9744505566.
Adding to 421444 its reverse (444124), we get a palindrome (865568).
The spelling of 421444 in words is "four hundred twenty-one thousand, four hundred forty-four", and thus it is an iban number.